Difference between revisions of "Decline Curve Analysis"

Revision as of 15:48, 26 October 2017

Decline Curve Analysis DCA is an empirical method for rate decline analysis and rate forecasting published by Arps in 1945 ^[1].

DCA is applied for Wells and Reservoirs production forecasting.

b

= decline parametr, dimensionless

D_i

= Decline factor per time t, dimensionless

q_i

= initial rate, any rate units applies

q(t)

= rate at time t, any rate units applies

t

= forecast time, days

↑ Arps, J. J. (1945). "Analysis of Decline Curves". Transactions of the AIME. Society of Petroleum Engineers. 160 (01).
↑ "KAPPA Dynamic Data Analysis (DDA) book".

@@ Line 36: / Line 36: @@
 === Nomenclature ===
-:<math> A_1..A_{11} </math> = coefficients
+:<math> b </math> = decline parametr, dimensionless
-:<math> \rho_r </math> = reduced density, dimensionless
+:<math> D_i </math> = Decline factor per time t, dimensionless
-:<math> P </math> = pressure, psia
+:<math> q_i </math> = initial rate, any rate units applies
-:<math> P_{pc} </math> = pseudo critical pressure, psia
+:<math> q(t) </math> = rate at time t, any rate units applies
-:<math> P_{pr} </math> = pseudoreduced pressure, dimensionless
+:<math> t </math> = forecast time, days
-:<math> SG_g </math> = gas specific gravity, dimensionless
-:<math> T </math> = temperature, °R
-:<math> T_{pc} </math> = pseudo critical temperature, °R
-:<math> T_{pr} </math> = pseudoreduced temperature, dimensionless
-:<math> z </math> = gas compressibility factor, dimensionless
 == References ==